You're right. Italians have beefed up their security as well.
7:00 a.m. - News conference with British Home Secretary.
8:00 a.m. - Homeland Security news conference with Gonzales and Chertoff.
Just read at Ace of Spades that the plan was to blow up the planes OVER MAJOR AMERICAN CITIES as the planes descended for landing.
That would explain the nugget that this was planned to be bigger than 9/11.